9 extern void *memset(void *dest, int val, size_t count);
10 extern void *memcpy(void *dest, const void *src, size_t count);
11 extern void *memmove(void *dest, const void *src, size_t count);
12 extern int memcmp(const void *mem1, const void *mem2, size_t count);
15 extern int strlen(const char *string);
16 extern int strcmp(const char *str1, const char *str2);
17 extern int strncmp(const char *str1, const char *str2, size_t len);
18 extern char *strcpy(char *dst, const char *src);
19 extern char *strdup(const char *src);